Java中TreeSet 使用范例代码，treeset范例,import java.

Java中TreeSet 使用范例代码，treeset范例,import java.

import java.util.TreeSet;public class myTreeSet {   public static void main(String[] args) {      TreeSet<String> animals = new TreeSet<String>();      animals.add("Dog");      animals.add("Cat");      animals.add("Sparrow");      animals.add("Iguana");      animals.add("Dragon");      animals.add("Peacock");      System.out.println("Number of animals = " + animals.size());      for (String name : animals) {         System.out.println(name);      }      System.out.println("Animal before Sparrow: " + animals.lower("Sparrow"));      System.out.println("Animal after Sparrow: " + animals.higher("Sparrow"));      System.out.println("First element: " + animals.first());      System.out.println("Last element: " + animals.last());   }}